Unable to check update for my Apple Watch

In order for us to help you, can you tell guys what series watch you havE? What is the current WatchOS version? What model iPhone? What is its current iOIS version? Without knowing that, see:

Update your Apple Watch - Apple Support

If you see 'Unable to Verify Update' when updating Apple Watch - Apple Support

If you don’t have enough space to update your Apple Watch - Apple Support

What model of phone is it and what version of ios is it running?

What model of watch is it and what version of WatchOS is it running?.

What troubleshooting steps have you tried?.

What errror messages are you receiving?.